Locomotive safety throttle-lock



C. H. BELLAMY.

LOCOMOTIVE SAFETY THROTTLE LOCK.

APPLICATION FILED MAY 23. l9.9.

Patented Mar. 8, 1921.

INA/ENTER [TH/m ETHEELLfl/W 13 y fim d CHARLES B IIZRAM BELLAMY, OF OTTAWA, ONTARIO, CANADAd LOCOMOTIVE SAFETY THROTTLE-LOCK.

Specification of Letters Patent.

Patented Mar. 8, 1921.

Application filed May 23, 1919. Serial No. 299,184.

T all whom itmay concern:

Be it known that I, CHAnLns HIRAM BEL- LAHY, a subjectof the King of Great Britain, and a resident of the city of Ottawa, in the Province of Ontario, Dominion of Canada, have invented certain new and useful Improvements in Locomotive Safety Throttle-Locks, of which the following is a specification.

This invention relates to improvements in locomotive safety throttle locks.

It is well known in railroad practice that locomotives often become runaway due to the fact that the throttle valve becomes inadvertently opened due to creeping or jarring, and steam is thus admitted through the throttle to the cylinders, so that the locomotive then starts while not under control an engineer or other authorized person, and one of the objects of the present invention is to so secure the throttle when shut that it cannot become opened in any way unless it is manually opened by the engineer in charge or other authorized person.

Further objects are to permit or the improved safety lock being mounted on throttle levers at present in use, to eliminate backlash and wear on the several parts of the lock, to render the control of the lock simultaneous with the actuation of the throttle lever and generally to adapt the several parts to better perform the functions required of them.

With the above and other objects in view the invention consists essentially of the improved construction hereinafter described in detail in the following specification and accompanying drawings forming part of the same. i

In the drawings:

Figure 1 is a side elevation of a throttle lever embodying my invention.

Fig. 2 is a fragmentary enlarged side elevation of a throttle lever showing my improved pawl and quadrant connection.

Fig. 3 is a longitudinal section of the party of the device shown in Fig. 2.

Like characters of reference refer to like parts in the several figures.

Referring to the drawings, A represents a boiler head of a locomotive boiler and B the throttle lever. This throttle lever is pivotally connected at the lower end to the outer end of a link 10, the inner end of which is pivotally attached to a bracket 11 secured to the boiler head adjacent to the lower end of the lever B.

The throttle valve spindle 12 is pivotally attached to the pin 13, and carries a quadrant 14 which coacts with a pawl 15 mounted on the lever B.

This lever is formed adjacent to'the arouate serrated upper edge of the quadrant 1 1 w1th a rectangular or like slot 16 in which the lateral projection 17 of the pawl 15 is slidably mounted, and this pawl is held in position by means of a plate 18 slidably engaging the outer face of the lever B secured to the projection 17 by means of the set screw 19.

A pin 20 extends through the plate 18 and is threaded into the pawl 15, and the stem of this pin slidably engages with a slot 21 provided in the lower end of the link 22, the upper end of which is pivotally connected at 23 to the hand grip 24 which in turn is pivotally connected to the upper end of the throttle lever B.

The hand grip 24: controls the movement of the link 22and the said hand grip is normally held angularly disposed to the longitudinal axis of the lever B by means of av side spring 25 of any convenient length, one end of which is attached to the lower end of the hand grip 24: and the other end is anchored to the lever B. I

This side spring may be of any convenient length and in the embodiment illustrated it has been shortened for the sake of clarity in the drawings.

The pawl 15-is provided with a spindle 26 the upper end of which slidably engages with an eye-pin 27 threaded or otherwise secured to the lever B, and between the upper face of the pawl 15 and the under face of the eye-pin 27 a spiral spring 28 is located, which encircles the said spindle.

The link 22 is provided intermediate of its length with a pair of spaced pins 29 adapted to engage with the upper and lower edges of the locking member 30, one end of which is pivotally secured to the lever B and the other end is provided with a recess 31 adapted to engage with a pin 32 secured to a guide member 33 which projects outwardly from the boiler head.

It should be particularly noted that the outer edge at the forward end of the locking member is curvilinear as shown at 35, so that it will readily ride over the pin 32 when closing the. throttle and so secure the lever B in position.

\Vhen a locomotive equipped with a throttle lever and safety throttle lock of this description is in use the engineer when opening the throttle rotates the hand rip 24 so moving the link 22 longitudinjlly, and during this movement of the link the locking member 30 'is rotated about its pivotal point and the recess 31 is disengaged from the pin 32 so allowing the lever being actuated.

During this longitudinal movement of the link 22 the pawl '15 will have been moved upwardly under the action of the pin which is engaged by the slotted lower end ofthe link 22,and when the pawl 15 has become disengaged from the serrated upper edge of the quadrant 14, the lever B may berotated about its lower pivot point, and longitudinal motion will thus be transmittedto the throttle spindle 12.

When the spindle has been, inoved'to the desired extent and the engineer desires to maintain the lever B in a fixed position he releases the hand grip 24, so thatthe link 22 will be movedlongitudinally under action of the spring 25 and the pawl 15 will be positively pressed into engagement with the serrated upper edge of the quadrant by means of the spring 28;

It will be understood that should the side spring 25 fail then the pawl 15 will still be controlled by the spring 28.

The upper and lower edges of the locking member 30 and the pins 29 and 32 will be case hardened so that backlash or wear of the several coacting members of the lock will not take place.

When the throttle has to be closed the engineer will grip the hand grip 24 rotating the same toward the lever B and thereby transmitting a longitudinal movement to the link 22, and in this way the pawl 15 is disengaged from the quadrant 14:, and the grip 24, for if the lever B'were pressed inwardlyv then the edge 35 of the locking memactuating the link.

ber 30 would ride over the pin 32, andat .the same time transmit motion to the link 22, which would disengage the pawl 15 from the quadrant 1iand'on the'recess 31 of the locking member 30 engaging the pin 32, the link 22 would be moved longitudinally by the spring 25, and the pawl 15 reengaged above construction and many'apparently widely different embodiments of my lnvention within 'thesco-pe of the claims con structed without departing from the spirit or scope thereof, it is intended that all matter contained in the accompanying specification and drawing shall be interpreted as illustrative and not in-a' limiting sense.

What I claim as my invention is:

1. The combination with athrottle lever,

of a'locking member pivctally mounted to the lever, a pin with whichthe locking member engages, .alink, a pawl actuated by the link, a quadrant coacting with the pawl,a pair of pins on the link engaging opposite edges of the locking member and means for 2. The combination with a throttle lever of a stationary member carrying a pin, a

locking member carried by the lever adapted to engage with the pin for automatically looking the lever inclosed position, a link slidably mounted on the lever, a pawl actuated by the link, a quadrant ccacting with the pawl, a pair cl pins'on thelink engag ingopposite oi the locking member, and means for. actuating the link. I

3. The combination with a throttle lever, of a guide having'a pin thereon, a locking member pivotaliy mounted on the lever to coact with the said Jill, a link, a pawl actuated by the link, a quadrant coacting with the pawl, a pair of pins on the link engaging opposite edges of the locking member,

and means for actuating the link and designed to rock the locking member, as and for the purpose specified. o

In witness whereofhave hereunto set my hand inthe presence of a witness.

CHARLES. HIHAM BELLAMY. Witness:

RUSSEL 3. SMART. 

